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Vulnerability details: VCID-tyyt-v48f-eqg5
Vulnerability ID VCID-tyyt-v48f-eqg5
Aliases CVE-2020-6814
Summary Mozilla developers and community members Byron Campen, Jason Kratzer, and Christian Holler reported memory safety bugs present in Firefox 73 and Firefox ESR 68.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-6814.json
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
epss 0.00919 https://api.first.org/data/v1/epss?cve=CVE-2020-6814
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-6814
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2020-6814
archlinux Critical https://security.archlinux.org/AVG-1112
archlinux Critical https://security.archlinux.org/AVG-1115
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-08
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-09
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-10
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-6814.json
https://api.first.org/data/v1/epss?cve=CVE-2020-6814
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1592078%2C1604847%2C1608256%2C1612636%2C1614339
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20503
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6805
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6806
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6807
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6811
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6812
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6814
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-08/
https://www.mozilla.org/security/advisories/mfsa2020-09/
https://www.mozilla.org/security/advisories/mfsa2020-10/
1812205 https://bugzilla.redhat.com/show_bug.cgi?id=1812205
ASA-202003-11 https://security.archlinux.org/ASA-202003-11
ASA-202003-8 https://security.archlinux.org/ASA-202003-8
AVG-1112 https://security.archlinux.org/AVG-1112
AVG-1115 https://security.archlinux.org/AVG-1115
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
CVE-2020-6814 https://nvd.nist.gov/vuln/detail/CVE-2020-6814
mfsa2020-08 https://www.mozilla.org/en-US/security/advisories/mfsa2020-08
mfsa2020-09 https://www.mozilla.org/en-US/security/advisories/mfsa2020-09
mfsa2020-10 https://www.mozilla.org/en-US/security/advisories/mfsa2020-10
RHSA-2020:0905 https://access.redhat.com/errata/RHSA-2020:0905
RHSA-2020:0914 https://access.redhat.com/errata/RHSA-2020:0914
RHSA-2020:0918 https://access.redhat.com/errata/RHSA-2020:0918
RHSA-2020:0919 https://access.redhat.com/errata/RHSA-2020:0919
USN-4299-1 https://usn.ubuntu.com/4299-1/
USN-4328-1 https://usn.ubuntu.com/4328-1/
USN-4335-1 https://usn.ubuntu.com/4335-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-6814.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-6814
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-6814
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.75013
EPSS Score 0.00919
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:40.552598+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-09.yml 37.0.0